Grantarhabdus meddii Black, 1971
Gephyrorhabdus Hill, 1976
Black, M., (1971): Coccoliths of the Speeton Clay and Sutterby Marl. - Proceedings of the Yorkshire Geological Society, 38: 381-424.
Hill, M.E., (1976): Lower Cretaceous calcareous nannofossils from Texas and Oklahoma. - Palaeontographica Abteilung B, 156: 103-179.